Use of music during colonoscopy: An updated meta-analysis of randomized controlled trials

Table 2 Quality assessment summary of all included studies

Ref.	Study design	Random sequence generation	Allocation con-cealment	Blinding	Blinding outcome assessment	Incomplete outcome data	Selective reporting	Other bias	Quality assessment
De silva et al[26], 2016	RCT	Adequate	Adequate	Double-blinded	Adequate	None	None	None	High
Martindale et al[33], 2013	RCT	Adequate	Adequate	Double-blinded	Adequate	None	None	None	High
Costa et al[19], 2010	RCT	Adequate	Inadequate	Single-blinded	Adequate	None	None	None	Moderate
Bechtold et al[35], 2006	RCT	Adequate	Not described	None	Inadequate	None	None	None	Low
Ovayolu et al[18], 2006	RCT	Adequate	Adequate	Double-blinded	Adequate	None	None	None	High
Harikumar et al[28], 2006	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	Moderate
Uedo et al[39], 2004	RCT	Not described	Not described	Double-blinded	Adequate	None	None	None	Low
López-Cepero Andrada et al[25], 2004	RCT	Not described	Adequate	Double-blinded	Adequate	None	None	None	Moderate
Smolen et al[32], 2002	RCT	Not described	Adequate	Double-blinded	Adequate	None	None	None	Moderate
Schiemann et al[38], 2002	RCT	Not described	Adequate	Double-blinded	Adequate	None	None	None	Moderate
Lee et al[29], 2002	RCT	Not described	Adequate	Double-blinded	Adequate	None	None	None	Moderate

RCT: Randomized controlled trial.